<html>
  <head>
    <style>
      body {
        background-color: thistle;
      }
    </style>
  </head>
  <body>
    <script type="text/javascript">
      const elm = parent.document.getElementById('testSrcChange1');
      elm.textContent = 'src-change1';
    </script>
  </body>
</html>
